diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 12ba8f3cf58..905cfad2951 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -870,6 +870,7 @@ playwright.storybook.config.ts @grafana/grafana-frontend-platform
 /public/app/core/utils/accessControl.ts @grafana/identity-access-team
 /public/app/core/utils/applyStateChanges.ts @grafana/dashboards-squad
 /public/app/core/utils/arrayMove.ts @grafana/grafana-frontend-platform
+/public/app/core/utils/isFrontendService.ts @grafana/grafana-frontend-platform
 /public/app/core/utils/auth.ts @grafana/identity-access-team
 /public/app/core/utils/browser* @grafana/grafana-frontend-platform
 /public/app/core/utils/colors.ts @grafana/grafana-frontend-platform
diff --git a/devenv/frontend-service/docker-compose.yaml b/devenv/frontend-service/docker-compose.yaml
index 727a36a3b66..fd744e29ccd 100644
--- a/devenv/frontend-service/docker-compose.yaml
+++ b/devenv/frontend-service/docker-compose.yaml
@@ -35,7 +35,7 @@ services:
       GF_DEFAULT_APP_MODE: development
       GF_PANELS_ENABLE_ALPHA: true
       GF_SERVER_CDN_URL: http://localhost:3010
-      GF_FEATURE_TOGGLES_ENABLE: multiTenantFrontend enableNativeHTTPHistogram
+      GF_FEATURE_TOGGLES_ENABLE: enableNativeHTTPHistogram
       GF_DATABASE_URL: postgres://grafana:grafana@postgres:5432/grafana
       GF_SERVER_ROUTER_LOGGING: true
       GF_LOG_LEVEL: info
diff --git a/packages/grafana-data/src/types/config.ts b/packages/grafana-data/src/types/config.ts
index 485b1ec4294..29079be8bd8 100644
--- a/packages/grafana-data/src/types/config.ts
+++ b/packages/grafana-data/src/types/config.ts
@@ -195,6 +195,9 @@ export interface BootData {
     light: string;
     dark: string;
   };
+
+  /** @deprecated Internal Grafana usage only. This property will be removed at any time. */
+  _femt?: boolean;
 }
 
 /**
diff --git a/packages/grafana-data/src/types/featureToggles.gen.ts b/packages/grafana-data/src/types/featureToggles.gen.ts
index 614feba90a6..d4c846c2f53 100644
--- a/packages/grafana-data/src/types/featureToggles.gen.ts
+++ b/packages/grafana-data/src/types/featureToggles.gen.ts
@@ -965,10 +965,6 @@ export interface FeatureToggles {
   */
   pluginsAutoUpdate?: boolean;
   /**
-  * Register MT frontend
-  */
-  multiTenantFrontend?: boolean;
-  /**
   * Enables the alerting list view v2 preview toggle
   */
   alertingListViewV2PreviewToggle?: boolean;
diff --git a/pkg/api/api.go b/pkg/api/api.go
index a1ba8591044..d9689f92eb4 100644
--- a/pkg/api/api.go
+++ b/pkg/api/api.go
@@ -84,10 +84,8 @@ func (hs *HTTPServer) registerRoutes() {
 	r.Get("/login", hs.LoginView)
 	r.Get("/invite/:code", hs.Index)
 
-	if hs.Features.IsEnabledGlobally(featuremgmt.FlagMultiTenantFrontend) {
-		// Temporarily expose the full bootdata via API
-		r.Get("/bootdata", reqNoAuth, hs.GetBootdata)
-	}
+	// Temporary MT-frontend config endpoint
+	r.Get("/bootdata", reqNoAuth, hs.GetBootdata)
 
 	// authed views
 	r.Get("/", reqSignedIn, hs.Index)
diff --git a/pkg/api/frontendsettings.go b/pkg/api/frontendsettings.go
index c7ee1818700..7b8230df5a3 100644
--- a/pkg/api/frontendsettings.go
+++ b/pkg/api/frontendsettings.go
@@ -32,9 +32,12 @@ import (
 // NOTE: this should not be added to the public API docs, and is useful for a transition
 // towards a fully static index.html -- this will likely be replaced with multiple calls
 func (hs *HTTPServer) GetBootdata(c *contextmodel.ReqContext) {
+	c, span := hs.injectSpan(c, "api.GetBootdata")
+	defer span.End()
+
 	data, err := hs.setIndexViewData(c)
 	if err != nil {
-		c.Handle(hs.Cfg, http.StatusInternalServerError, "Failed to get settings", err)
+		c.JsonApiErr(http.StatusInternalServerError, "Failed to get settings", err)
 		return
 	}
 	c.JSON(http.StatusOK, data)
diff --git a/pkg/services/featuremgmt/registry.go b/pkg/services/featuremgmt/registry.go
index a80b38250c6..4a5d9f8a704 100644
--- a/pkg/services/featuremgmt/registry.go
+++ b/pkg/services/featuremgmt/registry.go
@@ -1664,13 +1664,6 @@ var (
 			FrontendOnly: false,
 			Owner:        grafanaPluginsPlatformSquad,
 		},
-		{
-			Name:         "multiTenantFrontend",
-			Description:  "Register MT frontend",
-			Stage:        FeatureStageExperimental,
-			FrontendOnly: false,
-			Owner:        grafanaFrontendPlatformSquad,
-		},
 		{
 			Name:         "alertingListViewV2PreviewToggle",
 			Description:  "Enables the alerting list view v2 preview toggle",
diff --git a/pkg/services/featuremgmt/toggles_gen.csv b/pkg/services/featuremgmt/toggles_gen.csv
index 2c1bae54ff0..479533a14b8 100644
--- a/pkg/services/featuremgmt/toggles_gen.csv
+++ b/pkg/services/featuremgmt/toggles_gen.csv
@@ -216,7 +216,6 @@ grafanaAssistantInProfilesDrilldown,GA,@grafana/observability-traces-and-profili
 postgresDSUsePGX,experimental,@grafana/oss-big-tent,false,false,false
 tempoAlerting,experimental,@grafana/observability-traces-and-profiling,false,false,true
 pluginsAutoUpdate,experimental,@grafana/plugins-platform-backend,false,false,false
-multiTenantFrontend,experimental,@grafana/grafana-frontend-platform,false,false,false
 alertingListViewV2PreviewToggle,privatePreview,@grafana/alerting-squad,false,false,true
 alertRuleUseFiredAtForStartsAt,experimental,@grafana/alerting-squad,false,false,false
 alertingBulkActionsInUI,GA,@grafana/alerting-squad,false,false,true
diff --git a/pkg/services/featuremgmt/toggles_gen.go b/pkg/services/featuremgmt/toggles_gen.go
index 91761a72af7..2d381369453 100644
--- a/pkg/services/featuremgmt/toggles_gen.go
+++ b/pkg/services/featuremgmt/toggles_gen.go
@@ -875,10 +875,6 @@ const (
 	// Enables auto-updating of users installed plugins
 	FlagPluginsAutoUpdate = "pluginsAutoUpdate"
 
-	// FlagMultiTenantFrontend
-	// Register MT frontend
-	FlagMultiTenantFrontend = "multiTenantFrontend"
-
 	// FlagAlertingListViewV2PreviewToggle
 	// Enables the alerting list view v2 preview toggle
 	FlagAlertingListViewV2PreviewToggle = "alertingListViewV2PreviewToggle"
diff --git a/pkg/services/featuremgmt/toggles_gen.json b/pkg/services/featuremgmt/toggles_gen.json
index 193ef690009..c19449bd9f0 100644
--- a/pkg/services/featuremgmt/toggles_gen.json
+++ b/pkg/services/featuremgmt/toggles_gen.json
@@ -2229,7 +2229,8 @@
       "metadata": {
         "name": "multiTenantFrontend",
         "resourceVersion": "1753448760331",
-        "creationTimestamp": "2025-04-25T09:24:25Z"
+        "creationTimestamp": "2025-04-25T09:24:25Z",
+        "deletionTimestamp": "2025-09-08T17:06:39Z"
       },
       "spec": {
         "description": "Register MT frontend",
diff --git a/pkg/services/frontend/index.html b/pkg/services/frontend/index.html
index 276cb4494b4..10cc7234b78 100644
--- a/pkg/services/frontend/index.html
+++ b/pkg/services/frontend/index.html
@@ -252,7 +252,7 @@
           const rawBootData = await loadBootData();
 
           window.grafanaBootData = {
-            _femt: true,
+            _femt: true, // isFrontendService() needs this
             ...rawBootData,
           }
 
diff --git a/pkg/tests/apis/preferences/preferences_test.go b/pkg/tests/apis/preferences/preferences_test.go
index 6579384c539..04152b4026a 100644
--- a/pkg/tests/apis/preferences/preferences_test.go
+++ b/pkg/tests/apis/preferences/preferences_test.go
@@ -30,7 +30,6 @@ func TestIntegrationPreferences(t *testing.T) {
 		DisableAnonymous:  true,
 		EnableFeatureToggles: []string{
 			featuremgmt.FlagGrafanaAPIServerWithExperimentalAPIs,
-			featuremgmt.FlagMultiTenantFrontend, // So we can compare to boot-data preferences
 		},
 	})
 
diff --git a/public/app/core/components/AppChrome/TopBar/SignInLink.test.tsx b/public/app/core/components/AppChrome/TopBar/SignInLink.test.tsx
index c6903685aef..90e5360c136 100644
--- a/public/app/core/components/AppChrome/TopBar/SignInLink.test.tsx
+++ b/public/app/core/components/AppChrome/TopBar/SignInLink.test.tsx
@@ -22,9 +22,9 @@ describe('SignInLink', () => {
     expect(link).toHaveAttribute('target', '_self');
   });
 
-  describe('with multiTenantFrontend toggle enabled', () => {
+  describe('with frontend-service enabled', () => {
     beforeAll(() => {
-      config.featureToggles.multiTenantFrontend = true;
+      config.bootData._femt = true;
     });
 
     it('should render a link to the login page', () => {
diff --git a/public/app/core/components/AppChrome/TopBar/SignInLink.tsx b/public/app/core/components/AppChrome/TopBar/SignInLink.tsx
index 7c93f089741..13149e8e381 100644
--- a/public/app/core/components/AppChrome/TopBar/SignInLink.tsx
+++ b/public/app/core/components/AppChrome/TopBar/SignInLink.tsx
@@ -4,12 +4,12 @@ import { useLocation } from 'react-router-dom-v5-compat';
 
 import { GrafanaTheme2, locationUtil, textUtil } from '@grafana/data';
 import { Trans } from '@grafana/i18n';
-import { config } from '@grafana/runtime';
 import { useStyles2 } from '@grafana/ui';
 import { contextSrv } from 'app/core/services/context_srv';
+import { isFrontendService } from 'app/core/utils/isFrontendService';
 
 export function SignInLink() {
-  const femt = Boolean(config.featureToggles.multiTenantFrontend);
+  const femt = isFrontendService();
   const location = useLocation();
   const styles = useStyles2(getStyles);
   let loginUrl = femt
diff --git a/public/app/core/navigation/GrafanaRoute.tsx b/public/app/core/navigation/GrafanaRoute.tsx
index c5c751366dc..10cef729d3f 100644
--- a/public/app/core/navigation/GrafanaRoute.tsx
+++ b/public/app/core/navigation/GrafanaRoute.tsx
@@ -3,6 +3,7 @@ import { Navigate, useLocation } from 'react-router-dom-v5-compat';
 
 import { config, locationSearchToObject, navigationLogger, reportPageview } from '@grafana/runtime';
 import { ErrorBoundary } from '@grafana/ui';
+import { isFrontendService } from 'app/core/utils/isFrontendService';
 
 import { useGrafana } from '../context/GrafanaContext';
 import { contextSrv } from '../services/context_srv';
@@ -64,7 +65,7 @@ export function GrafanaRouteWrapper({ route }: Pick<Props, 'route'>) {
   const location = useLocation();
 
   // Perform login check in the frontend now
-  if (config.featureToggles.multiTenantFrontend) {
+  if (isFrontendService()) {
     const routeRequiresSignin = !route.allowAnonymous && !config.anonymousEnabled;
     if (routeRequiresSignin && !contextSrv.isSignedIn) {
       contextSrv.setRedirectToUrl();
diff --git a/public/app/core/navigation/types.ts b/public/app/core/navigation/types.ts
index 8fafbfa2a8b..757eeefb725 100644
--- a/public/app/core/navigation/types.ts
+++ b/public/app/core/navigation/types.ts
@@ -23,7 +23,7 @@ export interface RouteDescriptor {
 
   /**
    * Allow the route to be access by anonymous users.
-   * Currently only used if the `multiTenantFrontend` feature toggle is enabled.
+   * Currently only used when using the frontend-service.
    */
   allowAnonymous?: boolean;
 }
diff --git a/public/app/core/utils/isFrontendService.ts b/public/app/core/utils/isFrontendService.ts
new file mode 100644
index 00000000000..0d1cb690ac4
--- /dev/null
+++ b/public/app/core/utils/isFrontendService.ts
@@ -0,0 +1,9 @@
+import { config } from '@grafana/runtime';
+
+/**
+ * Returns true if the current instance is using the frontend-service.
+ * @internal
+ */
+export function isFrontendService() {
+  return config.bootData._femt;
+}